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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) loan	Jun. 30, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 75,865	$ 75,865	$ 72,235
Number of modified contracts | loan	3	11
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 113	$ 13,430
Post-Modification	$ 225	$ 9,351
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	11	11
Balance	$ 8,612	$ 8,612
Specific reserves	69
Specific reserves for the TDRs	2,514
Charge offs	30
Specific reserves allocated to TDRs	7,400	7,400	5,700
Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	16,926	16,926	18,280
Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	43,784	43,784	38,210
Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	15,155	15,155	15,745
Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	50,837	50,837	47,984
TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,425	11,425	11,979
TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	30,768	30,768	27,512
TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	8,644	8,644	8,493
TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	25,028	25,028	24,251
TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	5,501	5,501	6,301
TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	13,016	13,016	10,698
TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,511	6,511	7,252
TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 0	$ 0	0
Commercial & industrial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured			$ 22,828
Number of modified contracts | loan		22	24
Real estate | Mixed use
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Real estate | Commercial & industrial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 21,513	$ 21,513	$ 22,828
Real estate | Commercial & industrial | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,386	11,386	11,604
Real estate | Commercial & industrial | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,477	3,477	4,009
Real estate | Commercial & industrial | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,650	6,650	7,215
Real estate | Commercial & industrial | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Real estate | Commercial & industrial | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	11,561	11,561	11,919
Real estate | Commercial & industrial | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,689	3,689	3,891
Real estate | Commercial & industrial | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	1,952	1,952	1,583
Real estate | Commercial & industrial | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	5,920	5,920	6,445
Real estate | Commercial & industrial | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Commercial business | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	22,545	$ 22,545	$ 19,845
Number of modified contracts | loan		24	28
Commercial business | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	39	$ 39	$ 375
Commercial business | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	20,659	20,659	18,192
Commercial business | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	1,847	1,847	1,278
Commercial business | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Commercial business | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	10,090	10,090	9,869
Commercial business | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	1,812	1,812	2,410
Commercial business | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	7,847	7,847	6,818
Commercial business | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	431	431	641
Commercial business | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Trade Finance and Other | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,779	6,779	5,311
Trade Finance and Other | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Trade Finance and Other | TDR on accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,632	6,632	5,311
Trade Finance and Other | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	147	147	0
Trade Finance and Other | TDR on accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Trade Finance and Other | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,377	3,377	2,463
Trade Finance and Other | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0	0
Trade Finance and Other | TDR on non-accrual | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	3,217	3,217	2,297
Trade Finance and Other | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	160	160	166
Trade Finance and Other | TDR on non-accrual | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Troubled debt restructured			0
Consumer and other | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 6,779	$ 6,779	$ 5,311
Number of modified contracts | loan		7	4
Legacy
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	3	10
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 113	$ 13,400
Post-Modification	$ 225	$ 9,324
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	10	10
Balance	$ 8,585	$ 8,585
Legacy | Real estate
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Legacy | Real estate | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	4
Balance	$ 4,714
Legacy | Real estate | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member]
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1
Balance	$ 2,886
Legacy | Real estate | Retail
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1
Balance	$ 489	$ 489
Legacy | Real estate | Hotel & motel
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Legacy | Real estate | Gas station & car wash
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Legacy | Real estate | Mixed use
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Legacy | Real estate | Industrial & warehouse
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Legacy | Real estate | Other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Legacy | Real estate | Commercial & industrial | Rate concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan		1
Legacy | Commercial business
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	2	8
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 113	$ 11,201
Post-Modification	$ 114	$ 7,755
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	8	8
Balance	$ 5,210	$ 5,210
Legacy | Commercial business | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	4
Balance	$ 496
Legacy | Trade finance
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 2,199
Post-Modification	$ 0	$ 1,458
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1	1
Balance	$ 2,886	$ 2,886
Legacy | Consumer And Other Portfolio Segment [Member]
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Legacy | Consumer and other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	1	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 111	$ 111
Acquired
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 30
Post-Modification	$ 0	$ 27
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1	1
Balance	$ 27	$ 27
Charge offs	$ 0	$ 0
Acquired | Real estate
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Acquired | Real estate | Retail
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Real estate | Hotel & motel
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Real estate | Gas station & car wash
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Real estate | Mixed use
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Acquired | Real estate | Industrial & warehouse
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Real estate | Other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Commercial business
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Trade finance
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0
Post-Modification	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Balance	$ 0	$ 0
Acquired | Consumer And Other Portfolio Segment [Member]
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1	1
Balance	$ 27	$ 27
Acquired | Consumer and other
Financing Receivable, Modifications [Line Items]
Number of modified contracts | loan	0	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 30
Post-Modification	$ 0	$ 27

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Number of financing receivables that have been modified by troubled debt restructurings.

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